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NitWit Blog

Seeing is believing... All Screens are not Created Equal!

James Fife | 20 September, 2018
AVG Mtg 2-2018 dnp vs Slate (17)

When it comes to ambient light rejecting screens, not all screens are created equal. Especially off axis. Audience viewing across a standard +/- 45 degree angle really shows the difference. 

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The Pixel and Its Parts

James Fife | 22 February, 2018
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With any electronically created image there is a grid, or an array made of dots or squares that are called pixels.  This is true for a live dot flip board, a direct view LED display, OLED, LCD, DLP, D-ILA, Micro LED quantum dots, or any other technology.  This pixel structure is the base component of the image.  An image (size?) is simply a sum of many pixels that each light up to a specific brightness or color to create a completed image.  Pixels have a few major things they all share regardless of technology. 

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How Far?  What Resolution?  What Density of Pixel?

James Fife | 19 February, 2018
Visual Acuity

I am often asked about the relation of video technology and viewer position and typically in two forms.  First, “how far away can a viewer be before they see a good image on a screen/tile/display?”  Or the opposite, “I have a room that is this 17' (5.2m), so what resolution or image density should I use in the design?”   Well, the answer is possible to calculate, but first you have to understand what a pixel is, what parts make it up, and the math that allows all the parts to be calculated.  I am going to start a mini-series leading up to an article release in February tying this into how to calculate viewing distance using a technology agnostic formula set based on human vision.  So stay tuned!  This series is going to change the way you think of video in a today’s modern environment. 

Link to FULL ARTICLE

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Av Designers – Why Your Tool Box Should Include Optical Screens

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Here are some real world examples from our Race to Black series. Let’s use a room with an ambient light level of 30fc and the screen with 10fc of light on it. Using a typical projection screen, which has an ambient reflected value of 35%, the best black level possible would be 10 x .35 = 3.5fc. To get a 20:1 contrast ratio you would have to have a projector that would enable the white point to be 3.5x20 = 70fc. That is achievable, but very bright and uncomfortable to look at. Realistically, you would have to have a projector achieve 30fc and no more to be comfortable, and the max contrast would be 30 / 3.5 = 8.57:1. Viewable, but poor at best.

Using an optical screen with an ALR value of just 5% the same room would have a black level of 10 x 0.05 = 0.5. So, to hit a contrast level of 20:1 the projector would only need to be able to hit a white point of 0.5x20 = 10fc. Now that would be very easily done, but the white level should be between 75% and 150% of the room ambient with 1:1 being perfect. So if you were to use a projector that could hit just 30fc on screen, then it would be very comfortable and offer an outstanding contrast ratio of 30fc / 0.5fc = 60:1. 

At the end of the day, it’s easy to see based on the example above that an optical screen can make a huge difference in image quality. The room was barely capable of supporting projection originally, but with an optical screen it was capable of achieving great contrast and image quality. So where prior a good designer would have only used a light emitting technology such as a flat panel or direct view LED, now a projection system could be used. Combine that with the fact that it really is a race to black, optical screens are a must have in every designer’s tool set. 

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